JP2020203713A - Paper package - Google Patents

Abstract

To provide a paper package that can prevent insect pests from damaging the content.SOLUTION: A paper package 1 is formed of a laminate 20 that includes: a paper base material 22; a printing layer 21 printed at one surface of the paper base material 22; and a thermal adhesive resin layer 23 disposed at the other surface of the paper base material 22. The paper package is sealed by thermal adhesion between opposing thermal adhesive resin layers 23. The printing layer 21 or the thermal adhesive resin layer 23 contains an adsorbent containing a hydrophobic zeolite.SELECTED DRAWING: Figure 2

Description

The present invention relates to a paper package that is sealed by heat bonding of a thermosetting resin layer provided on a paper base material.

Patent Document 1 discloses a package in which a thermosetting resin layer is provided on a paper base material. In the laminate forming this package, an ink layer is formed on one surface of a paper base material made of paper, and a thermosetting resin layer (sealant layer) is provided on the other surface via a foam sheet. By arranging the thermosetting resin layer on the inner surface side and heat-bonding the opposing thermosetting resin layers, a package (packaging bag) having one end opened is formed. The package is sealed by filling the contents and heat-bonding the openings.

Japanese Unexamined Patent Publication No. 2018-69460 (pages 4 to 8, FIG. 2)

However, according to the conventional packaging, when confectionery such as candy or chocolate is packaged, the sweet scent component released from the confectionery passes through the packaging and is released to the outside. For this reason, pests such as Indian-meal moth and Spodoptera frugiperda may be attracted to the scent component. Since the larvae of Indian-meal moth and the larva of Spodoptera frugiperda have high perforation ability, there is a risk of breaking the package and invading and damaging the contents.

An object of the present invention is to provide a paper package capable of preventing damage to the contents by pests.

In order to achieve the above object, the present invention includes a paper base material, a printing layer printed on one surface of the paper base material, and a heat-adhesive resin layer arranged on the other side of the paper base material. In a paper package formed of a laminate and capable of being sealed by thermal adhesion of the opposite thermal adhesive resin layers, the printing layer or the thermal adhesive resin layer contains an adsorbent containing hydrophobic zeolite. It is characterized by.

Further, the present invention is characterized in that, in the paper package having the above structure, the SiO ₂ / Al ₂ O ₃ molar ratio of the hydrophobic zeolite forming the adsorbent is 30 to 10,000.

Further, the present invention is characterized in that, in a paper package having the above structure, the adsorbent is formed of a hydrophobic zeolite carrying a chemical adsorbent.

Further, the present invention is characterized in that, in the paper package having the above structure, the adsorbent is contained in the thermosetting resin layer, and the thermosetting resin layer is formed by an extruded resin of the thermosetting resin. ..

Further, in the paper packaging having the above structure, the present invention is a coating film in which the adsorbent is contained in the thermosetting resin layer and the thermosetting resin layer is coated with the thermosetting resin on the paper base material. It is characterized by consisting of.

Further, in the paper package having the above structure, the printing layer has an ink layer coated with printing ink and an OP varnish layer coated with varnish on the upper layer of the ink layer, and the printing ink Alternatively, the varnish is characterized by containing the adsorbent.

Further, the present invention is characterized in that, in the paper package having the above structure, the printing ink or the varnish containing the adsorbent is water-based without containing alcohol.

Further, the present invention is characterized in that the laminated body does not contain a stretched film in the package having the above structure.

According to the present invention, the paper package can be sealed by heat-adhesion of the thermosetting resin layer, and the printing layer or the thermosetting resin layer arranged on the paper substrate contains an adsorbent containing hydrophobic zeolite. Will be done. As a result, the sweet scent component of confectionery is adsorbed on the hydrophobic zeolite and prevented from leaking to the outside from the paper package. Therefore, it is possible to prevent damage to the contents by pests that have a habit of being attracted to the scent component of confectionery.

A perspective view showing a paper package according to a first embodiment of the present invention. Sectional drawing which shows the wrapping paper which forms the paper wrapping body of 1st Embodiment of this invention.

<First Embodiment>
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a perspective view of the paper package of the first embodiment. The paper package 1 is composed of a three-way seal bag having an opening 1a at the upper end, and is provided with a storage portion 9 for storing the contents inside. The contents stored in the storage unit 9 are made of foods including confectionery.

The paper wrapping body 1 is formed by heat-bonding three sides (both sides and bottom sides) of the peripheral portion of the wrapping paper 20 (see FIG. 2) composed of two laminated bodies by the sealing portion 3. One wrapping paper 20 may be bent and the two sides (both sides) of the peripheral portion may be heat-bonded by the sealing portion 3. The paper package 1 can be sealed by closing the opening 1a by thermal adhesion.

FIG. 2 is a schematic cross-sectional view showing a layer structure of a wrapping paper 20 made of a laminate forming the paper wrapping body 1. In the wrapping paper 20, the printing layer 21 is arranged on one side of the paper base material 22, and the thermosetting resin layer 23 is arranged on the other side. As a result, since the wrapping paper 20 does not contain a stretched film, it is possible to reduce the amount of petroleum-derived materials and reduce the environmental load.

The paper base material 22 is not particularly limited, but high-quality paper, thin imitation paper, bleached kraft paper, unbleached kraft paper, single-gloss kraft paper, heavy bag kraft paper, pure white roll paper, glassin paper, white paperboard, paper tube base paper, Liner base paper, recycled paper and the like can be used. The paper base material 22 may be a single-layer paper or a multi-layer paper.

The basis weight of the paper base material 22 is preferably 45 to 150 g / m ² . If the basis weight of the paper base material 22 is smaller than 45 g / m ² , the wrapping paper 20 is easily torn, and if it is larger than 150 g / m ^2, it becomes difficult to form a bag shape.

The printing layer 21 is printed on the paper base material 22 and has an ink layer 21a and an OP (Over Printing) varnish layer 21b. The ink layer 21a is composed of a coating film obtained by applying a printing ink on a paper base material 22, and the OP varnish layer 21b is composed of a coating film obtained by applying a varnish on the ink layer 21a. The ink layer 21a and the OP varnish layer 21b are provided on the entire surface of the paper base material 22. The ink layer 21a may be provided only on the formed portion of the pattern or the like.

The ink forming the ink layer 21a is mainly composed of urethane resin, acrylic resin, nitrocellulose resin and the like, and contains cyan, magenta, yellow and black coloring pigments and white pigments, respectively. The OP varnish layer 21b improves the abrasion resistance and heat resistance of the surface of the wrapping paper 20 by the coating film of the varnish.

The amount of ink applied to the ink layer 21a can be, for example, 0.5 to 3 g / m ² . The amount of varnish applied to the OP varnish layer 21b can be, for example, 0.5 to 3 g / m ² . In the present embodiment, the ink coating amount of the ink layer 21a is 1 g / m ² , and the varnish coating amount of the OP varnish layer 21b is 1 g / m ² .

The thermosetting resin layer 23 is formed of an extruded resin extruded onto the paper base material 22. The sealing portion 3 (see FIG. 1) is formed by superimposing the opposing thermosetting resin layers 23 on top of each other, pressurizing and heating them to heat-bond them. Examples of the extruded resin forming the thermosetting resin layer 23 include polyethylene and polypropylene. In this embodiment, polyethylene (Novatec (registered trademark) LC600A) manufactured by Japan Polyethylene Corporation is used.

The thickness of the thermosetting resin layer 23 made of the extruded resin is, for example, 15 to 60 μm. At this time, if the weight ratio of the paper base material 22 to the entire paper packaging body 1 is set to 50% or more by the amount of the thermosetting resin layer 23, the paper packaging body 1 having a high effect of reducing the environmental load can be realized. it can.

The thermosetting resin layer 23 may be formed of a resin film that is dry-laminated on the paper base material 22. Examples of the resin film forming the heat-adhesive resin layer 23 include a low-density polyethylene film, a linear low-density polyethylene film, and a non-stretched polypropylene film. The thickness of the thermosetting resin layer 23 made of the resin film is, for example, 25 to 60 μm.

Further, the thermosetting resin layer 23 contains an adsorbent. When the content of the paper package 1 is confectionery such as candy or chocolate, if alcohols, which are sweet scent components of confectionery, leak to the outside, pests are attracted. Therefore, the adsorbent contained in the thermosetting resin layer 23 contains hydrophobic zeolite having high adsorption performance to alcohols. Hydrophobic zeolite is an inorganic porous body that physically adsorbs scent components such as alcohols.

Generally, the higher the SiO ₂ / Al ₂ O ₃ molar ratio, the higher the hydrophobicity of zeolite. Therefore, the hydrophobic zeolite contained in the thermosetting resin layer 23 preferably has a SiO ₂ / Al ₂ O ₃ molar ratio of 30 to 10,000. As a result, the adsorption of water can be suppressed, and high adsorption performance for alcohols can be obtained.

The hydrophobic zeolite can have an arbitrary outer shape such as a spherical shape, a rod shape, or an elliptical shape, and can have an arbitrary shape such as a powder shape, a lump shape, or a granular shape. It is more preferable to make the hydrophobic zeolite into a powder form from the viewpoints of film forming property of the thermosetting resin layer 23, uniform dispersion in the thermosetting resin, kneading characteristics, and the like.

The size of the hydrophobic zeolite can be appropriately selected depending on the application, but the average particle size is preferably 0.01 μm to 10 μm. The average particle size is more preferably 0.1 μm to 8 μm, and even more preferably 1 μm to 7 μm. Here, the average particle size is a value measured by a dynamic light scattering method.

When the average particle size is smaller than 0.01 μm, the hydrophobic zeolite is likely to aggregate, and the dispersibility of the hydrophobic zeolite in the heat-adhesive resin is lowered. Further, if the average particle size is larger than 10 μm, the amount of hydrophobic zeolite added cannot be increased and the surface area is reduced, so that a sufficient adsorption effect cannot be obtained. In addition, the film-forming property of the thermosetting resin layer 23 deteriorates.

If the content of the hydrophobic zeolite in the thermosetting resin layer 23 is 0.1% by mass or more, a sufficient adsorption effect can be exhibited. The content of the hydrophobic zeolite is more preferably 0.3% by mass or more, and further preferably 0.5% by mass or more. On the other hand, in order to obtain good film-forming property and heat-adhesiveness of the thermosetting resin layer 23, the content of the hydrophobic zeolite is preferably 15% by mass or less, and more preferably 10% by mass or less.

Further, the adsorbent contained in the thermosetting resin layer 23 may be a hydrophobic zeolite carrying a chemical adsorbent. For example, the chemisorbent can be supported by the hydrophobic zeolite by impregnating the hydrophobic zeolite with a solution containing the chemisorbent and then drying the solution.

Chemisorbents have reactive functional groups that chemically react with odorous substances to bind them. Therefore, it is possible to improve the adsorption performance not only for alcohols released from confectionery and the like but also for other scent components.

When the target scent component is an acidic substance such as a carboxylic acid, hydrogen sulfide, or mercaptan, a compound having a basic functional group can be used as the reactive functional group. As compounds having a basic functional group, compounds having a hydroxyl group (hydroxides such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, iron hydroxide, etc.), metal carbonates (sodium carbonate, calcium carbonate, etc.), metals Hydrogen carbonate (sodium hydrogen carbonate, etc.), amino group-containing compounds (polyamines such as tetramethylenediamine, alkylamines, ethanolamines, piperidine, etc.), amide group-containing compounds (2-acrylamide-2-methylpropanesulfonic acid, etc.) Can be used.

For example, when a compound having a hydroxyl group is used when the scent component is a carboxylic acid, the carboxyl group and the hydroxyl group cause a chemical reaction to bond with each other, and the scent component is adsorbed.

When the target scent component is a basic substance such as ammonia or amines, a compound having an acidic functional group can be used as the reactive functional group. As the compound having an acidic functional group, phosphoric acid, sulfonic acid, carboxylic acid, metal salts thereof and the like can be used. For example, when a compound having a phosphoric acid group is used when the scent component is ammonia, the ammonia and the phosphoric acid group cause a chemical reaction to bond with each other, and the scent component is adsorbed.

When the target fragrance component is an aldehyde, an amino group-containing compound can be used, and an amino group-containing compound having a plurality of primary amino groups at the ends is particularly preferable. As a result, the aldehyde group and the amino group cause a chemical reaction to bond, and the scent component is adsorbed.

Furthermore, by using an amphoteric substance (metal oxide such as zinc oxide) as a chemisorbent, acidic and basic substances can be adsorbed.

The thermosetting resin layer 23 is formed of a single-layer resin composition in which an adsorbent is kneaded in a resin, but the thermosetting resin layer 23 may have a multi-layer structure composed of different resins.

The adsorbent may be uniformly dispersed in the layer of the thermosetting resin layer 23, or may be dispersed by providing a concentration gradient in the thickness direction. For example, the adsorbent may be dispersed in the thermosetting resin layer 23 by providing a concentration gradient that tends to increase from the inner surface to the outer surface when the paper package 1 is formed. As a result, the thermal adhesiveness of the thermosetting resin layer 23 is improved.

Further, the adsorbent may be dispersed in the thermosetting resin layer 23 by providing a concentration gradient that tends to decrease from the inner surface to the outer surface when the paper package 1 is formed. As a result, the interlayer adhesive strength between the thermosetting resin layer 23 and the paper base material 25 is improved. Further, the adsorbent may be dispersed by providing a concentration gradient that tends to decrease from the central portion in the thickness direction of the thermosetting resin layer 23 toward both surfaces. As a result, the thermal adhesiveness of the thermosetting resin layer 23 and the interlayer adhesive strength between the thermosetting resin layer 23 and the paper base material 25 are improved.

The seal portion 3 is formed by arranging the thermosetting resin layer 23 of the wrapping paper 20 on the inner surface side and heat-bonding the opposing thermosetting resin layers 23. As a result, a paper package 1 that can be sealed by heat-bonding the thermosetting resin layer 23 along the opening 1a can be obtained. At this time, the print layer 21 is arranged on the outer surface side of the paper base material 22. Then, after filling the storage portion 9 with the contents, heat-bonding is performed along the opening 1a to seal the paper package 1 and the contents are sealed.

The thermosetting resin layer 23 containing the adsorbent is adjacent to the contents and adsorbs alcohols, which are sweet scent components released from confectionery and the like. As a result, since the scent component does not leak to the outside, it is possible to prevent damage to the contents by habitual insects attracted to the scent component of confectionery.

According to the present embodiment, the paper package 1 can be sealed by the thermal adhesion of the thermosetting resin layer 23, and the adsorbent containing the hydrophobic zeolite in the thermosetting resin layer 23 arranged on the paper base material 22. Is contained. As a result, the sweet scent component of the confectionery is adsorbed on the hydrophobic zeolite and prevented from leaking to the outside from the paper package 1. Therefore, it is possible to prevent damage to the contents by pests that have a habit of being attracted to the scent component of confectionery.

Further, since the SiO ₂ / Al ₂ O ₃ molar ratio of the hydrophobic zeolite is 30 to 10,000, it is possible to easily realize an adsorbent having high adsorption performance to alcohols.

Further, when the adsorbent is formed of an inorganic porous body in which a chemical adsorbent is supported on hydrophobic zeolite, fragrance components other than alcohols released from confectionery and the like can also be adsorbed. Therefore, the damage caused by pests can be further prevented.

Further, since the thermosetting resin layer 23 is formed of the extruded resin of the thermosetting resin, the paper package 1 in which the thermosetting resin layer 23 containing the adsorbent is arranged on the paper base material 25 can be easily provided. It can be realized.

Further, since the laminated wrapping paper 20 does not contain the stretched film, it is possible to reduce the amount of petroleum-derived materials and reduce the environmental load.

<Second Embodiment>
Next, the second embodiment will be described. In this embodiment, the thermosetting resin layer 23 is formed of a coating film containing hydrophobic zeolite. Other parts are the same as those in the first embodiment.

The thermosetting resin layer 23 is composed of a coating film that coats the paper base material 22, and is formed by applying a coating liquid of the thermosetting resin on the paper base material 22. As the thermosetting resin for coating, an acrylic resin, a polyolefin resin, a vinyl chloride / vinyl acetate copolymer resin, or the like can be used. In this embodiment, a polyolefin-based thermosetting resin (Chemipal (registered trademark) S300) manufactured by Mitsui Chemicals, Inc. is used.

The amount of the thermosetting resin coating liquid applied can be, for example, 1.5 to 6 g / m ² . In this embodiment, it is set to 3 g / m ² . Further, the thermosetting resin layer 23 may be provided only on the heat-bonding portion on the paper base material 22, but it is more preferable to provide the thermosetting resin layer 23 on the entire surface. As a result, water resistance and strength against piercing can be obtained. Further, when the adsorbent is contained in the coating liquid of the thermosetting resin, the adsorption performance for the scent component of confectionery can be improved.

When the thermosetting resin layer 23 is formed by the coating film, the thickness is small, so that the paper packaging 1 is excellent in recyclability. Further, it is more desirable because the amount of petroleum-derived materials can be reduced and the environmental load can be reduced as compared with the extruded resin and the resin film.

When the content of the hydrophobic zeolite in the heat-adhesive resin layer 23 is 0.1% by mass to 15% by mass as described above, good adsorption performance, film-forming property and heat-adhesion property can be obtained. The lower limit of the content of the hydrophobic zeolite is more preferably 0.3% by mass, and further preferably 0.5% by mass. Further, it is more preferable that the upper limit of the content of the hydrophobic zeolite is 10% by mass.

According to the present embodiment, as in the first embodiment, the thermosetting resin layer 23 contains an adsorbent containing hydrophobic zeolite. Therefore, it is possible to prevent the contents from being harmed by pests that have a habit of being attracted to the scent component of confectionery.

Further, since the thermosetting resin layer 23 is made of a coating film in which the thermosetting resin is coated on the paper base material 22, it is possible to obtain a paper package 1 which is excellent in recyclability and can reduce the environmental load. At this time, the weight ratio of the paper base material 22 to the entire paper packaging body 1 can be easily increased to 50% or more, and the paper packaging body 1 having a high effect of reducing the environmental load can be easily realized.

<Third Embodiment>
Next, the third embodiment will be described. In this embodiment, hydrophobic zeolite is contained in the printing layer 21 instead of the thermosetting resin layer 23. Other parts are the same as those in the first embodiment.

The thermosetting resin layer 23 is formed of the same extruded resin as in the first embodiment. The thermosetting resin layer 23 may be formed by the same coating film as in the second embodiment. Further, although the thermosetting resin layer 23 does not contain an adsorbent containing hydrophobic zeolite, it may be contained in the same manner as in the first and second embodiments.

The ink forming the ink layer 21a of the printing layer 21 contains an adsorbent containing hydrophobic zeolite similar to the above. The ink forming the ink layer 21a is a water-based ink that uses water as a solvent and does not contain alcohol. Therefore, it is possible to prevent deterioration of printing suitability and deterioration of adsorption performance due to adsorption of alcohol in the ink by the adsorbent.

The size of the hydrophobic zeolite is preferably 0.01 μm to 10 μm in average particle size. The average particle size is more preferably 0.1 μm to 8 μm, and even more preferably 1 μm to 7 μm. When the average particle size is smaller than 0.01 μm, the hydrophobic zeolite is likely to aggregate, and the dispersibility of the hydrophobic zeolite in the binder resin of the ink is lowered. Further, if the average particle size is larger than 10 μm, the amount of hydrophobic zeolite added cannot be increased and the surface area is reduced, so that a sufficient adsorption effect cannot be obtained. In addition, the surface of the ink layer 21a is uneven, which causes deterioration of printing performance.

If the content of the hydrophobic zeolite in the ink layer 21a is 0.1% by mass or more, a sufficient adsorption effect can be exhibited. The content of the hydrophobic zeolite is more preferably 0.3% by mass or more, and further preferably 0.5% by mass or more. On the other hand, in order to obtain good processing suitability for the ink layer 21a, the content of the hydrophobic zeolite is preferably 15% by mass or less, and more preferably 10% by mass or less.

The ink layer 21a may be provided only on the portion of the paper base material 22 on which the pattern or the like is formed, but it is more preferable to provide the ink layer 21a on the entire surface because the scent component of confectionery can be reliably adsorbed.

The adsorbent may be contained in the varnish forming the OP varnish layer 21b provided on the entire surface of the paper base material 22. At this time, the adsorbent of the ink layer 21a may be omitted.

According to the present embodiment, the printing layer 21 contains an adsorbent containing hydrophobic zeolite as in the first embodiment. Therefore, it is possible to prevent the contents from being harmed by pests that have a habit of being attracted to the scent component of confectionery.

Further, the printing ink forming the ink layer 21a or the varnish forming the OP varnish layer 21b contains an adsorbent. Therefore, the print layer 21 containing the adsorbent can be easily realized.

Further, since the ink forming the ink layer 21a is water-based and does not contain alcohol, it is possible to prevent deterioration of printing suitability and deterioration of adsorption performance due to adsorption of alcohol in the ink by the adsorbent. Similarly, when the varnish forming the OP varnish layer 21b contains an adsorbent, it is preferable to use an alcohol-free water-based varnish.

In the first to third embodiments, the paper wrapping body 1 is formed of a three-way sticker bag, but the paper wrapping body 1 is formed in another form such as a pillow type bag or a self-standing type bag. May be good.

According to the present invention, it can be used as a packaging bag or the like for packaging confectionery or the like.

1 Paper wrapping body 1a Opening 3 Sealing part 9 Storage part 20 Wrapping paper 21 Printing layer 21a Ink layer 21b OP varnish layer 22 Paper base material 23 Thermal adhesive resin layer

Claims (8)

The paper base material is formed of a laminate having a printing layer printed on one surface of the paper base material and a heat-adhesive resin layer arranged on the other surface of the paper base material, and the heat-adhesion is opposed to each other. A paper wrapping body that can be sealed by heat-adhesion of a sex resin layer, wherein the printing layer or the heat-adhesive resin layer contains an adsorbent containing hydrophobic zeolite. The paper package according to claim 1, wherein the hydrophobic zeolite forming the adsorbent has a SiO ₂ / Al ₂ O ₃ molar ratio of 30 to 10,000. The paper package according to claim 1 or 2, wherein the adsorbent is formed of a hydrophobic zeolite carrying a chemical adsorbent. The invention according to any one of claims 1 to 3, wherein the adsorbent is contained in the thermosetting resin layer, and the thermosetting resin layer is formed of an extruded resin of the thermosetting resin. Paper packaging. Claims 1 to claim that the adsorbent is contained in the thermosetting resin layer, and the thermosetting resin layer comprises a coating film in which the thermosetting resin is coated on the paper substrate. The paper packaging according to any one of 3. The printing layer has an ink layer coated with a printing ink and an OP varnish layer coated with a varnish on the upper layer of the ink layer, and the printing ink or the varnish contains the adsorbent. The paper packaging according to any one of claims 1 to 3. The paper package according to claim 6, wherein the printing ink or the varnish containing the adsorbent is water-based and does not contain alcohol. The paper package according to any one of claims 1 to 7, wherein the laminate does not contain a stretched film.

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